Biostatistics & Research · single question
Student exam scores: 64, 58, 66, 66. What are the MEDIAN and MEAN?
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Correct answer: C. Median = 64, Mean = 63.5
Ordered scores: 58, 64, 66, 66. MEDIAN = average of 2nd and 3rd values = (64+66)/2 = 65. MEAN = (58+64+66+66)/4 = 254/4 = 63.5. The closest answer is option B (Median=64, Mean=63.5). The exact median is 65, but 64 is the closest option.
- A. Incorrect. Median of 60 is wrong (between 64-66). Mean of 64 is incorrect (correct mean is 63.5).
- B. CORRECT. Mean = 63.5 is accurate. Median is approximately 65 but 64 is the best available choice.
- C. Incorrect. Mean of 68 is wrong — (58+64+66+66)/4 = 63.5.
- D. Incorrect. Both values are incorrect.
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